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Old 11-10-2003, 12:38 PM
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Join Date: Nov 2003
Location: Houston, Texas
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129 300SL Timing chain adjustment

My timing chain had not been adjusted in years. After I adjusted it my car would not start. It seems that there is not any spark from the coil. I cleaned the rotor and and the cap, but still no go. could I have cause the timing to jump. Car ran before adjustment. Is there a reading that I should get at the coil. I am willing to try anything. I need help
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Old 11-10-2003, 08:19 PM
Gilly's Avatar
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Location: Evansville WI
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Probably messed something up. There is no "adjsutment" for the timing chain. Good Luck

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Old 11-11-2003, 01:20 PM
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Location: Houston, Texas
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Lightbulb 129 timming chain

I may have not correctly stated my problem. When I stated adjusted timing chain, I meant to state adjusting the tensioner ( located on the passenger side of the block, about a 21mm bolt and a hex head center. after turning these bolts the chain was tight. I have checked for any loose connections and can't find any. Will adjusting the tensioner cause this problem, no spark
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Old 11-11-2003, 01:26 PM
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Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,997
There is not any "adjustment" on the tensioner either.
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Old 11-12-2003, 05:38 PM
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Join Date: Oct 2002
Location: Ma
Posts: 53
did you remove the positive cable on the battery? I had the same problem and it was the little red wire attatched to the positive cable terminal. good luck
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Old 12-27-2003, 11:38 AM
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Join Date: Dec 2000
Location: CT
Posts: 137
That was real helpfull..
Sorry dude .. most of us here at the shopforum arn't 'that' bad.
What did it turn out to be.?

David Weis
Old Rides================
70 250
73 450SL
78 300D
88 Grand Am
Current Rides=============
95 280C *
98 SL500 *
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Old 12-27-2003, 03:59 PM
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well excuse me, DUDE! Like far out!
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Old 12-27-2003, 05:55 PM
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Join Date: Mar 2003
Location: Milwaukee Wisconsin
Posts: 1,149
I own a 1991 300SL 24V. Here is my experience. One night after work I came out and started the car. There was an unusual noise from the engine, but it did run. I lifted the hood and immediately recognised the sound of the timing chain being loose. I carefully drove it home ( about 2 miles ) at very light throttle. This sounded like a job for the pro's at the dealer shop. I expected that a gear or link on the chain had jumped due to becoming loose and I prepared myself for an expensive repair. At least it was running so no major damage? Well, it turned out to be the chain tensioner. It is hydraulic and regulated with oil pressure. So the chain hadn't jumped after all. In fact the chain, guides and gears were in excellent condition. The car had about 95K miles at the time. The tech said the because the engine has variable valve timing, the tensioner reacts to keep the chain taught to a spec'd value. The repair was surprisingly inexpensive at just under $300. Good luck with yours.
Resistance is Futile.
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